First make sure you've calibrated your e-steps.
Using a digital caliper, measure the thickness of your filament at 5 different points and get the average. You'll find most filament is not actually 1.75mm in width, but usually less. Enter the measured filament diameter in your slicer.
Download a 20mm calibration cube from http://www.thingiverse.com/thing:271736
Using the cube load it into the slicer and set the following:
- two perimeters (2 walls)
- No infill
- No top and bottom layer
You should get a print that looks like this:
Use your caliper and measure the top layers of the wall at several points to get an average thickness. We are measuring the thickness of 2 lines/walls, since it's more realistic to what you would be printing everyday. I got measurements around 1.07mm with my current extrusion multiplier of 1 and extrusion width set automatically to 0.48mm (120% of nozzle width) for my 0.4mm nozzle. Using the formula below, lets calibrate the extrusion.
(desired thickness / measured thickness) * old extrusion multiplier = new extrusion multiplier
.96/1.07 * 1 = .89
I changed my extrusion multiplier to 0.89 and printed the model again. I still didn't get the correct thickness, so I repeated the process until, the magic number appeared.
Having the proper extrusion thickness should help with printing out correctly sized and properly extruded models. This is a process that might be needed on a per filament basis. Otherwise, just make sure to always measure your filament, prior to printing, otherwise it throws off all your hard work.
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